Thank you for reporting, we will resolve it shortly
Q.
In $E$. coli, the lac operon gets switched on when
Molecular Basis of Inheritance
Solution:
The repressor of the operon is synthesised (all-the- time-constitutively) from the $i$ gene. The repressor protein binds to the operator region of the operon and prevents RNA polymerase from transcribing the operon. In the presence of an inducer, such as lactose or allolactose, the repressor is inactivated by interaction with the inducer. This allows $RNA$ polymerase access to the promoter and transcription proceeds. Thus, the lac operon gets switched on.